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參數(shù)資料
| 型號： | LT1370CT7 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | 10 A SWITCHING REGULATOR, 580 kHz SWITCHING FREQ-MAX, PZFM7 |
| 封裝： | PLASTIC, TO-220, 7 PIN |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 293K |
| 代理商： | LT1370CT7 |
11
LT1370
APPLICATIU
Layout Considerations
For maximum efficiency, LT1370 switch rise and fall times
are made as short as possible. To prevent radiation and
high frequency resonance problems, proper layout of the
components connected to the switch node is essential. B
field (magnetic) radiation is minimized by keeping output
diode, switch pin and output bypass capacitor leads as
short as possible. Figure 3 shows recommended posi-
tions for these components. E field radiation is kept low by
minimizing the length and area of all traces connected to
the switch pin. A ground plane should always be used
under the switcher circuitry to prevent interplane
coupling.
U
W
U
The high speed switching current path is shown schemati-
cally in Figure 4. Minimum lead length in this path is
essential to ensure clean switching and low EMI. The path
including the switch, output diode and output capacitor is
the only one containing nanosecond rise and fall times.
Keep this path as short as possible.
More Help
For more detailed information on switching regulator
circuits, please see Application Note 19. Linear
Technology also offers a computer software program,
SwitcherCAD
TM
, to assist in designing switching convert-
ers. In addition, our Applications Department is always
ready to lend a helping hand.
Figure 4
LOAD
V
OUT
L1
SWITCH
NODE
LT1370 F04
V
IN
HIGH
FREQUENCY
CIRCULATING
PATH
V
IN
NFB
GND
FB
V
SW
V
C
S/S
C
D
KEEP PATH FROM
V
,
OUTPUT DIODE,
OUTPUT CAPACITORS
AND GROUND RETURN
AS SHORT AS POSSIBLE
C
LT1370 F03
Figure 3. Layout Considerations—R Package
SwitcherCAD is a trademark of Linear Technology Corporation.
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